Popping noise

Was talking to my sister about my WH problems that you guys helped me with week or so ago. She was telling me that her WH makes 2 or 3 popping noises each time a hot water tap is opened. It is 3 years old. She is a little worried about so I thought I'd put it out there and see what you guys thought.

Was talking to my sister about my WH problems that you guys helped me with week or so ago. She was telling me that her WH makes 2 or 3 popping noises each time a hot water tap is opened. It is 3 years old. She is a little worried about so I thought I'd put it out there and see what you guys thought.

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It has a mineral build up at the bottom of the tank. It could use a good flushing.